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If I login via lightdm into an xmonad session and then switch to another user, two xsessions are running and I can switch between them via ctrl+alt+f7 resp. f8.

This is very fast (< 1s) on my laptop if no external screen is connected. However if I use an external monitor via displayport switching is very slow (> 10s). What may be the reason for this and how can I fix it?

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